Passivation of pinhole defect microelectrode arrays in ultrathin silica films immobilized on gold substrates |
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Authors: | Piotr Macech |
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Affiliation: | Department of Chemistry, University of Arizona, 1306 East University Boulevard, Tucson, AZ 85721, USA |
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Abstract: | Nanoscopic defects present in ultrathin (~ 6 nm) silica films covalently attached to gold substrates through a gold oxide layer exhibit a voltammetric response consistent with a random array of ultramicroelectrodes. These pinholes can be passivated via electrochemical polymerization of phenol to create insulating poly(phenylene) oxide plugs as documented by atomic force microscopy and infrared reflectance-absorbance spectroscopy. Passivation of pinholes is ~ 99.5% complete after 550 voltammetric cycles of oxidative electropolymerization. |
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Keywords: | Insulating overlayer Pinhole defect Microelectrode array Atomic force microscopy Fourier transform infrared spectroscopy Silica Electropolymerization Poly(phenylene) oxide |
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